diff options
Diffstat (limited to 'net/unix/af_unix.c')
-rw-r--r-- | net/unix/af_unix.c | 59 |
1 files changed, 29 insertions, 30 deletions
diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c index acc73ba8bad..1b5989b1b67 100644 --- a/net/unix/af_unix.c +++ b/net/unix/af_unix.c @@ -121,7 +121,7 @@ int sysctl_unix_max_dgram_qlen = 10; struct hlist_head unix_socket_table[UNIX_HASH_SIZE + 1]; -DEFINE_RWLOCK(unix_table_lock); +DEFINE_SPINLOCK(unix_table_lock); static atomic_t unix_nr_socks = ATOMIC_INIT(0); #define unix_sockets_unbound (&unix_socket_table[UNIX_HASH_SIZE]) @@ -130,7 +130,7 @@ static atomic_t unix_nr_socks = ATOMIC_INIT(0); /* * SMP locking strategy: - * hash table is protected with rwlock unix_table_lock + * hash table is protected with spinlock unix_table_lock * each socket state is protected by separate rwlock. */ @@ -214,16 +214,16 @@ static void __unix_insert_socket(struct hlist_head *list, struct sock *sk) static inline void unix_remove_socket(struct sock *sk) { - write_lock(&unix_table_lock); + spin_lock(&unix_table_lock); __unix_remove_socket(sk); - write_unlock(&unix_table_lock); + spin_unlock(&unix_table_lock); } static inline void unix_insert_socket(struct hlist_head *list, struct sock *sk) { - write_lock(&unix_table_lock); + spin_lock(&unix_table_lock); __unix_insert_socket(list, sk); - write_unlock(&unix_table_lock); + spin_unlock(&unix_table_lock); } static struct sock *__unix_find_socket_byname(struct sockaddr_un *sunname, @@ -250,11 +250,11 @@ static inline struct sock *unix_find_socket_byname(struct sockaddr_un *sunname, { struct sock *s; - read_lock(&unix_table_lock); + spin_lock(&unix_table_lock); s = __unix_find_socket_byname(sunname, len, type, hash); if (s) sock_hold(s); - read_unlock(&unix_table_lock); + spin_unlock(&unix_table_lock); return s; } @@ -263,7 +263,7 @@ static struct sock *unix_find_socket_byinode(struct inode *i) struct sock *s; struct hlist_node *node; - read_lock(&unix_table_lock); + spin_lock(&unix_table_lock); sk_for_each(s, node, &unix_socket_table[i->i_ino & (UNIX_HASH_SIZE - 1)]) { struct dentry *dentry = unix_sk(s)->dentry; @@ -276,7 +276,7 @@ static struct sock *unix_find_socket_byinode(struct inode *i) } s = NULL; found: - read_unlock(&unix_table_lock); + spin_unlock(&unix_table_lock); return s; } @@ -473,7 +473,7 @@ static int unix_dgram_connect(struct socket *, struct sockaddr *, static int unix_seqpacket_sendmsg(struct kiocb *, struct socket *, struct msghdr *, size_t); -static struct proto_ops unix_stream_ops = { +static const struct proto_ops unix_stream_ops = { .family = PF_UNIX, .owner = THIS_MODULE, .release = unix_release, @@ -494,7 +494,7 @@ static struct proto_ops unix_stream_ops = { .sendpage = sock_no_sendpage, }; -static struct proto_ops unix_dgram_ops = { +static const struct proto_ops unix_dgram_ops = { .family = PF_UNIX, .owner = THIS_MODULE, .release = unix_release, @@ -515,7 +515,7 @@ static struct proto_ops unix_dgram_ops = { .sendpage = sock_no_sendpage, }; -static struct proto_ops unix_seqpacket_ops = { +static const struct proto_ops unix_seqpacket_ops = { .family = PF_UNIX, .owner = THIS_MODULE, .release = unix_release, @@ -564,7 +564,7 @@ static struct sock * unix_create1(struct socket *sock) u = unix_sk(sk); u->dentry = NULL; u->mnt = NULL; - rwlock_init(&u->lock); + spin_lock_init(&u->lock); atomic_set(&u->inflight, sock ? 0 : -1); init_MUTEX(&u->readsem); /* single task reading lock */ init_waitqueue_head(&u->peer_wait); @@ -642,12 +642,12 @@ retry: addr->len = sprintf(addr->name->sun_path+1, "%05x", ordernum) + 1 + sizeof(short); addr->hash = unix_hash_fold(csum_partial((void*)addr->name, addr->len, 0)); - write_lock(&unix_table_lock); + spin_lock(&unix_table_lock); ordernum = (ordernum+1)&0xFFFFF; if (__unix_find_socket_byname(addr->name, addr->len, sock->type, addr->hash)) { - write_unlock(&unix_table_lock); + spin_unlock(&unix_table_lock); /* Sanity yield. It is unusual case, but yet... */ if (!(ordernum&0xFF)) yield(); @@ -658,7 +658,7 @@ retry: __unix_remove_socket(sk); u->addr = addr; __unix_insert_socket(&unix_socket_table[addr->hash], sk); - write_unlock(&unix_table_lock); + spin_unlock(&unix_table_lock); err = 0; out: up(&u->readsem); @@ -784,14 +784,14 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) err = vfs_mknod(nd.dentry->d_inode, dentry, mode, 0); if (err) goto out_mknod_dput; - up(&nd.dentry->d_inode->i_sem); + mutex_unlock(&nd.dentry->d_inode->i_mutex); dput(nd.dentry); nd.dentry = dentry; addr->hash = UNIX_HASH_SIZE; } - write_lock(&unix_table_lock); + spin_lock(&unix_table_lock); if (!sunaddr->sun_path[0]) { err = -EADDRINUSE; @@ -814,7 +814,7 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len) __unix_insert_socket(list, sk); out_unlock: - write_unlock(&unix_table_lock); + spin_unlock(&unix_table_lock); out_up: up(&u->readsem); out: @@ -823,7 +823,7 @@ out: out_mknod_dput: dput(dentry); out_mknod_unlock: - up(&nd.dentry->d_inode->i_sem); + mutex_unlock(&nd.dentry->d_inode->i_mutex); path_release(&nd); out_mknod_parent: if (err==-EEXIST) @@ -1063,10 +1063,12 @@ restart: /* Set credentials */ sk->sk_peercred = other->sk_peercred; - sock_hold(newsk); - unix_peer(sk) = newsk; sock->state = SS_CONNECTED; sk->sk_state = TCP_ESTABLISHED; + sock_hold(newsk); + + smp_mb__after_atomic_inc(); /* sock_hold() does an atomic_inc() */ + unix_peer(sk) = newsk; unix_state_wunlock(sk); @@ -1414,7 +1416,7 @@ static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, } else { sunaddr = NULL; err = -ENOTCONN; - other = unix_peer_get(sk); + other = unix_peer(sk); if (!other) goto out_err; } @@ -1476,7 +1478,6 @@ static int unix_stream_sendmsg(struct kiocb *kiocb, struct socket *sock, other->sk_data_ready(other, size); sent+=size; } - sock_put(other); scm_destroy(siocb->scm); siocb->scm = NULL; @@ -1491,8 +1492,6 @@ pipe_err: send_sig(SIGPIPE,current,0); err = -EPIPE; out_err: - if (other) - sock_put(other); scm_destroy(siocb->scm); siocb->scm = NULL; return sent ? : err; @@ -1860,7 +1859,7 @@ static int unix_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg) } default: - err = dev_ioctl(cmd, (void __user *)arg); + err = -ENOIOCTLCMD; break; } return err; @@ -1917,7 +1916,7 @@ static struct sock *unix_seq_idx(int *iter, loff_t pos) static void *unix_seq_start(struct seq_file *seq, loff_t *pos) { - read_lock(&unix_table_lock); + spin_lock(&unix_table_lock); return *pos ? unix_seq_idx(seq->private, *pos - 1) : ((void *) 1); } @@ -1932,7 +1931,7 @@ static void *unix_seq_next(struct seq_file *seq, void *v, loff_t *pos) static void unix_seq_stop(struct seq_file *seq, void *v) { - read_unlock(&unix_table_lock); + spin_unlock(&unix_table_lock); } static int unix_seq_show(struct seq_file *seq, void *v) |